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How to build an 8ft x 10ft Storage Shed

About the measurements

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Dimensions given in this project are in both Metric (mm) and Imperial (inches).
The metric measurements are given first followed by the standard measurements in brackets. For example: 100mm x 50mm (2" x 4").

The size (width and thickness) of the wood (lumber) referred to throughout this project is the nominal size.
That is in reference to the size of the lumber before it has been dressed (surfaced planed and/or seasoned).
When the wood has been dressed (surfaced, planed, seasoned), it is then the 'actual size' or the true size. The actual size of lumber is less than the nominal size.

Chances are you will use dressed (surfaced, planed, or seasoned) framing lumber for this project, which means in effect that the 'actual size' will be smaller than the 'nominal size'.
However, that's not really going to make a great deal of difference in the overall scheme of things.

Below is a 'nominal' versus 'actual' chart, listing the wood sizes of the framing lumber used in this project.

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'Nominal' versus 'actual' chart, listing the wood sizes of the framing lumber used in this project.

Standard (inches) North America
2" x 4" 1 1/2" x 3 1/2"
2" x 6" 1 1/2" x 5 1/2"
2" x 8" 1 1/2" x 7 1/2"
4" x 4" 3 1/2" x 3 1/2"
Metric (millimetres) Australasia
100mm x 50mm 90mm x 45mm
150mm x 50mm 140mm x 45mm
200mm x 50mm 190mm x 45mm
100mm x 100mm 90mm x 90mm

Australasia uses (mostly) the metric system and calls the bigger numeral first, example: 100mm x 50mm (100 millimetres by 50 millimetres). North America uses (mostly) the Imperial system and calls the smaller numeral first, example: 2" x 4" (2 inches by 4 inches).

For rounding-off purposes, the metric sizes in this project are not an exact match to the equivalent imperial sizes.
A structure built using the metric measurements will be approximately 1.6% smaller than the same structure using the imperial (ft and in) measurements. Not really worth worrying about.
The imperial measurements are more suited to North America. The metric measurements are more suited to Australasia and other countries.

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